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1   /*
2    * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
6    * under the terms of the GNU General Public License version 2 only, as
7    * published by the Free Software Foundation.  Oracle designates this
8    * particular file as subject to the "Classpath" exception as provided
9    * by Oracle in the LICENSE file that accompanied this code.
10   *
11   * This code is distributed in the hope that it will be useful, but WITHOUT
12   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14   * version 2 for more details (a copy is included in the LICENSE file that
15   * accompanied this code).
16   *
17   * You should have received a copy of the GNU General Public License version
18   * 2 along with this work; if not, write to the Free Software Foundation,
19   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20   *
21   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22   * or visit www.oracle.com if you need additional information or have any
23   * questions.
24   */
25  
26  package sun.reflect.generics.repository;
27  
28  import java.lang.reflect.Type;
29  import sun.reflect.generics.factory.GenericsFactory;
30  import sun.reflect.generics.parser.SignatureParser;
31  import sun.reflect.generics.tree.FieldTypeSignature;
32  import sun.reflect.generics.tree.MethodTypeSignature;
33  import sun.reflect.generics.tree.TypeSignature;
34  import sun.reflect.generics.visitor.Reifier;
35  
36  
37  
38  /**
39   * This class represents the generic type information for a constructor.
40   * The code is not dependent on a particular reflective implementation.
41   * It is designed to be used unchanged by at least core reflection and JDI.
42   */
43  public class ConstructorRepository
44      extends GenericDeclRepository<MethodTypeSignature> {
45  
46      private Type[] paramTypes; // caches the generic parameter types info
47      private Type[] exceptionTypes; // caches the generic exception types info
48  
49   // protected, to enforce use of static factory yet allow subclassing
50      protected ConstructorRepository(String rawSig, GenericsFactory f) {
51        super(rawSig, f);
52      }
53  
54      protected MethodTypeSignature parse(String s) {
55          return SignatureParser.make().parseMethodSig(s);
56      }
57  
58      /**
59       * Static factory method.
60       * @param rawSig - the generic signature of the reflective object
61       * that this repository is servicing
62       * @param f - a factory that will provide instances of reflective
63       * objects when this repository converts its AST
64       * @return a <tt>ConstructorRepository</tt> that manages the generic type
65       * information represented in the signature <tt>rawSig</tt>
66       */
67      public static ConstructorRepository make(String rawSig,
68                                               GenericsFactory f) {
69          return new ConstructorRepository(rawSig, f);
70      }
71  
72      // public API
73  
74   /*
75   * When queried for a particular piece of type information, the
76   * general pattern is to consult the corresponding cached value.
77   * If the corresponding field is non-null, it is returned.
78   * If not, it is created lazily. This is done by selecting the appropriate
79   * part of the tree and transforming it into a reflective object
80   * using a visitor.
81   * a visitor, which is created by feeding it the factory
82   * with which the repository was created.
83   */
84  
85      public Type[] getParameterTypes(){
86          if (paramTypes == null) { // lazily initialize parameter types
87              // first, extract parameter type subtree(s) from AST
88              TypeSignature[] pts = getTree().getParameterTypes();
89              // create array to store reified subtree(s)
90              Type[] ps = new Type[pts.length];
91              // reify all subtrees
92              for (int i = 0; i < pts.length; i++) {
93                  Reifier r = getReifier(); // obtain visitor
94                  pts[i].accept(r); // reify subtree
95                  // extract result from visitor and store it
96                  ps[i] = r.getResult();
97              }
98              paramTypes = ps; // cache overall result
99          }
100         return paramTypes.clone(); // return cached result
101     }
102 
103     public Type[] getExceptionTypes(){
104         if (exceptionTypes == null) { // lazily initialize exception types
105             // first, extract exception type subtree(s) from AST
106             FieldTypeSignature[] ets = getTree().getExceptionTypes();
107             // create array to store reified subtree(s)
108             Type[] es = new Type[ets.length];
109             // reify all subtrees
110             for (int i = 0; i < ets.length; i++) {
111                 Reifier r = getReifier(); // obtain visitor
112                 ets[i].accept(r); // reify subtree
113                 // extract result from visitor and store it
114                 es[i] = r.getResult();
115             }
116             exceptionTypes = es; // cache overall result
117         }
118         return exceptionTypes.clone(); // return cached result
119     }
120 }